i have fmf fattys on mine with power core 2 silencers and a 42 rear sprocket and a stock front and its got A LOT of low end power and torque. it wheelies with no problem. even riding the gas tank goose and and the front goes up. on another shee i have its completely stock. stock bore, gears, carbs, etc, with dmc 916's and it just SCREAMS up top. it bogs a lot in 2nd if u try to take off in second but once shee winds up SHEES GONE
as far as noise level . the DMC's are going to be A LOT louder. my fmfs are quiet.and my toomeys are. plug ur ears